Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/net/ipv4/netfilter/ipt_SAME.c b/net/ipv4/netfilter/ipt_SAME.c
new file mode 100644
index 0000000..7a0536d
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_SAME.c
@@ -0,0 +1,211 @@
+/* Same. Just like SNAT, only try to make the connections
+ * between client A and server B always have the same source ip.
+ *
+ * (C) 2000 Paul `Rusty' Russell
+ * (C) 2001 Martin Josefsson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 010320 Martin Josefsson <gandalf@wlug.westbo.se>
+ * * copied ipt_BALANCE.c to ipt_SAME.c and changed a few things.
+ * 010728 Martin Josefsson <gandalf@wlug.westbo.se>
+ * * added --nodst to not include destination-ip in new source
+ * calculations.
+ * * added some more sanity-checks.
+ * 010729 Martin Josefsson <gandalf@wlug.westbo.se>
+ * * fixed a buggy if-statement in same_check(), should have
+ * used ntohl() but didn't.
+ * * added support for multiple ranges. IPT_SAME_MAX_RANGE is
+ * defined in linux/include/linux/netfilter_ipv4/ipt_SAME.h
+ * and is currently set to 10.
+ * * added support for 1-address range, nice to have now that
+ * we have multiple ranges.
+ */
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/timer.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/netdevice.h>
+#include <linux/if.h>
+#include <linux/inetdevice.h>
+#include <net/protocol.h>
+#include <net/checksum.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ipt_SAME.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Martin Josefsson <gandalf@wlug.westbo.se>");
+MODULE_DESCRIPTION("iptables special SNAT module for consistent sourceip");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int
+same_check(const char *tablename,
+ const struct ipt_entry *e,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ unsigned int count, countess, rangeip, index = 0;
+ struct ipt_same_info *mr = targinfo;
+
+ mr->ipnum = 0;
+
+ if (strcmp(tablename, "nat") != 0) {
+ DEBUGP("same_check: bad table `%s'.\n", tablename);
+ return 0;
+ }
+ if (targinfosize != IPT_ALIGN(sizeof(*mr))) {
+ DEBUGP("same_check: size %u.\n", targinfosize);
+ return 0;
+ }
+ if (hook_mask & ~(1 << NF_IP_PRE_ROUTING | 1 << NF_IP_POST_ROUTING)) {
+ DEBUGP("same_check: bad hooks %x.\n", hook_mask);
+ return 0;
+ }
+ if (mr->rangesize < 1) {
+ DEBUGP("same_check: need at least one dest range.\n");
+ return 0;
+ }
+ if (mr->rangesize > IPT_SAME_MAX_RANGE) {
+ DEBUGP("same_check: too many ranges specified, maximum "
+ "is %u ranges\n",
+ IPT_SAME_MAX_RANGE);
+ return 0;
+ }
+ for (count = 0; count < mr->rangesize; count++) {
+ if (ntohl(mr->range[count].min_ip) >
+ ntohl(mr->range[count].max_ip)) {
+ DEBUGP("same_check: min_ip is larger than max_ip in "
+ "range `%u.%u.%u.%u-%u.%u.%u.%u'.\n",
+ NIPQUAD(mr->range[count].min_ip),
+ NIPQUAD(mr->range[count].max_ip));
+ return 0;
+ }
+ if (!(mr->range[count].flags & IP_NAT_RANGE_MAP_IPS)) {
+ DEBUGP("same_check: bad MAP_IPS.\n");
+ return 0;
+ }
+ rangeip = (ntohl(mr->range[count].max_ip) -
+ ntohl(mr->range[count].min_ip) + 1);
+ mr->ipnum += rangeip;
+
+ DEBUGP("same_check: range %u, ipnum = %u\n", count, rangeip);
+ }
+ DEBUGP("same_check: total ipaddresses = %u\n", mr->ipnum);
+
+ mr->iparray = kmalloc((sizeof(u_int32_t) * mr->ipnum), GFP_KERNEL);
+ if (!mr->iparray) {
+ DEBUGP("same_check: Couldn't allocate %u bytes "
+ "for %u ipaddresses!\n",
+ (sizeof(u_int32_t) * mr->ipnum), mr->ipnum);
+ return 0;
+ }
+ DEBUGP("same_check: Allocated %u bytes for %u ipaddresses.\n",
+ (sizeof(u_int32_t) * mr->ipnum), mr->ipnum);
+
+ for (count = 0; count < mr->rangesize; count++) {
+ for (countess = ntohl(mr->range[count].min_ip);
+ countess <= ntohl(mr->range[count].max_ip);
+ countess++) {
+ mr->iparray[index] = countess;
+ DEBUGP("same_check: Added ipaddress `%u.%u.%u.%u' "
+ "in index %u.\n",
+ HIPQUAD(countess), index);
+ index++;
+ }
+ }
+ return 1;
+}
+
+static void
+same_destroy(void *targinfo,
+ unsigned int targinfosize)
+{
+ struct ipt_same_info *mr = targinfo;
+
+ kfree(mr->iparray);
+
+ DEBUGP("same_destroy: Deallocated %u bytes for %u ipaddresses.\n",
+ (sizeof(u_int32_t) * mr->ipnum), mr->ipnum);
+}
+
+static unsigned int
+same_target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ struct ip_conntrack *ct;
+ enum ip_conntrack_info ctinfo;
+ u_int32_t tmpip, aindex, new_ip;
+ const struct ipt_same_info *same = targinfo;
+ struct ip_nat_range newrange;
+ const struct ip_conntrack_tuple *t;
+
+ IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
+ hooknum == NF_IP_POST_ROUTING);
+ ct = ip_conntrack_get(*pskb, &ctinfo);
+
+ t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+
+ /* Base new source on real src ip and optionally dst ip,
+ giving some hope for consistency across reboots.
+ Here we calculate the index in same->iparray which
+ holds the ipaddress we should use */
+
+ tmpip = ntohl(t->src.ip);
+
+ if (!(same->info & IPT_SAME_NODST))
+ tmpip += ntohl(t->dst.ip);
+
+ aindex = tmpip % same->ipnum;
+
+ new_ip = htonl(same->iparray[aindex]);
+
+ DEBUGP("ipt_SAME: src=%u.%u.%u.%u dst=%u.%u.%u.%u, "
+ "new src=%u.%u.%u.%u\n",
+ NIPQUAD(t->src.ip), NIPQUAD(t->dst.ip),
+ NIPQUAD(new_ip));
+
+ /* Transfer from original range. */
+ newrange = ((struct ip_nat_range)
+ { same->range[0].flags, new_ip, new_ip,
+ /* FIXME: Use ports from correct range! */
+ same->range[0].min, same->range[0].max });
+
+ /* Hand modified range to generic setup. */
+ return ip_nat_setup_info(ct, &newrange, hooknum);
+}
+
+static struct ipt_target same_reg = {
+ .name = "SAME",
+ .target = same_target,
+ .checkentry = same_check,
+ .destroy = same_destroy,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ return ipt_register_target(&same_reg);
+}
+
+static void __exit fini(void)
+{
+ ipt_unregister_target(&same_reg);
+}
+
+module_init(init);
+module_exit(fini);
+